Filter some sensitive characters in the webpage using Java program

Import java. io. charArrayWriter; import java. io. printWriter; import javax. servlet. http. httpServletResponse; import javax. servlet. http. httpServletResponseWrapper; public class Ct extends HttpServletResponseWrapper {private CharArrayWriter output; // rewrite tostring method public String toString () {return output. toString ();} public Ct (HttpServletResponse response) {super (response); this. output = new CharArrayWriter ();} public PrintWriter getWriter () {return new PrintWriter (output) ;}// Filter import java. io. IOException; import java. io. printWriter; import javax. servlet. filter; import javax. servlet. filterChain; import javax. servlet. filterConfig; import javax. servlet. servletException; import javax. servlet. servletRequest; import javax. servlet. servletResponse; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletResponse; public class HtmlFilter extends HttpServlet implements Filter {public void doFilter (ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {// set the response code response. setCharacterEncoding ("UTF-8"); PrintWriter out = response. getWriter (); Ct ct Ct = new Ct (HttpServletResponse) response); // execute the next chain. doFilter (request, ct); String resStr = ct. toString (). trim (); String newStr = ""; if (resStr. contains (" Er") {newStr = resStr. replaceAll (" Er", "***");} out. print (newStr);} public void init (FilterConfig filterConfig) throws ServletException {// TODO Auto-generated method stub} // xml configuration
 
   
      
   
    
Index. jsp
     
      
      
    
   
    
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HtmlFilter
     
    
    
   
    
Ecodeing
     
   
    
*. Jsp
     
    
 // Jsp page <% @ page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %>              My JSP 'index. jsp 'starting page
 
 
     
 
 
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